Heatsink and heatsink-positioning system

ABSTRACT

The present invention relates to a heatsink and a heatsink-positioning system. The heatsink-positioning system comprises a heatsink and a positioning device. The heatsink comprises a circular top, a ring-shaped sidewall and a plurality of foot portions. The ring-shaped sidewall connects to the circular top and extends away from the circular top. The ring-shaped sidewall has at least one first positioning portion used for fixing the heatsink. The foot portions connect to the ring-shaped sidewall and extend away from the ring-shaped sidewall. Each foot portion has an opening. The positioning device has at least one second positioning portion corresponding to the first positioning portion and is used for fixing the first positioning portion. By utilizing the heatsink-positioning system of the invention, the problem of displacement of the heatsink can be improved.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a heatsink and a heatsink-positioning system, particularly to a positioning system having a plurality of positioning portions for positioning a heatsink.

2. Description of the Related Art

Referring to FIG. 1, it shows a conventional heatsink-positioning system. The heatsink-positioning system 1 comprises a heatsink 10 and a positioning device 11. The heatsink 10 has a plurality of foot portions 101 and a top surface 102. The positioning device 11 has a fixing surface 111. The fixing surface 111 is a plane and is used for fixing the heatsink 10.

Since the top surface 102 of the conventional heatsink 10 is circular and the fixing surface 111 is a plane, the positioning device 11 can just contact the heatsink 10 by point-contact. Point-contact is a very unstable fixing method, so the heatsink 10 may rotate and then shift. Therefore, the fixing position will be unstable or fail.

Consequently, there is an existing need for providing a heatsink-positioning system to solve the above-mentioned problems.

SUMMARY OF THE INVENTION

One objective of the present invention is to provide a heatsink. The heatsink comprises a circular top, a ring-shaped sidewall and a plurality of foot portions. The ring-shaped sidewall connects to the circular top and extends away from the circular top. The ring-shaped sidewall has at least one first positioning portion used for fixing the heatsink. The foot portions connect to the ring-shaped sidewall and extend away from the ring-shaped sidewall.

Another objective of the present invention is to provide a heatsink-positioning system. The heatsink-positioning system comprises a heatsink and a positioning device. The heatsink comprises a circular top, a ring-shaped sidewall and a plurality of foot portions. The ring-shaped sidewall connects to the circular top and extends away from the circular top. The ring-shaped sidewall has at least one first positioning portion used for fixing the heatsink. The foot portions connect to the ring-shaped sidewall and extend away from the ring-shaped sidewall. The positioning device has at least one second positioning portion corresponding to the first positioning portion and is used for fixing the first positioning portion.

Since the ring-shaped sidewall of the heatsink of the invention has a plurality of first positioning portion and the positioning device has a plurality of second positioning portions corresponding to the first positioning portions respectively, the second positioning portions can firmly fix the first positioning portions, so that the problem of displacement of the heatsink can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a conventional heatsink-positioning system;

FIG. 2A shows a heatsink according to a first embodiment of the present invention;

FIG. 2B shows a sectional view of the heatsink according to the first embodiment of the present invention;

FIG. 3A shows a heatsink according to a second embodiment of the present invention;

FIG. 3B shows a sectional view of the heatsink according to the second embodiment of the present invention; and

FIG. 4 shows a heatsink-positioning system of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 2A and FIG. 2B, they show a heatsink according to a first embodiment of the present invention, wherein FIG. 2B shows the structure of a sectional view along the line 2B-2B in FIG. 2A. The heatsink 2 of the first embodiment comprises a circular top 21, a ring-shaped sidewall 22 and a plurality of foot portions 23. The circular top 21 has a ring-shaped protrusion 211 formed on the circular top 21 and near the edge of the circular top 21. The ring-shaped protrusion 211 can avoid the encapsulating compound bleeding and covering the circular top 21, so that the heat dissipation efficiency of the heatsink 2 will not be decreased. The ring-shaped sidewall 22 connects to the circular top 21 and extends away from the circular top 21. The ring-shaped sidewall 22 and the circular top 21 form a hat-shaped structure. The ring-shaped sidewall 22 has a plurality of first positioning portions 221. The first positioning portions 221 are planes and are used for fixing the heatsink 2.

In the embodiment, the ring-shaped sidewall 22 is a single incline. The foot portions 23 connect to the ring-shaped sidewall 22 and extend away from the ring-shaped sidewall 22. The foot portions 23 and the ring-shaped sidewall 22 form a height difference, and each foot portion 23 has an opening 231. The foot portion 23 has a first portion 232 and a second portion 233. One end of the first portion 232 connects to the ring-shaped sidewall 22 and the other end of the first portion 232 connects to the second portion 233, and the second portion 233 extends away from the first portion 232 horizontally. By utilizing the foot portions 23, the circular top 21 and the ring-shaped sidewall 22 can be supported. In addition, the heatsink 2 is made of copper, and a chromium layer or a nickel layer may be electroplated on the heatsink to avoid oxidation.

Referring to FIG. 3A and FIG. 3B, they show a heatsink according to a second embodiment of the present invention, wherein FIG. 3B shows the structure of a sectional view along the line 3B-3B in FIG. 3A. The heatsink 3 of the second embodiment comprises a circular top 31, a ring-shaped sidewall 32 and a plurality of foot portions 33. The difference between the heatsink 3 of the second embodiment and the heatsink 2 of the first embodiment is that the ring-shaped sidewall 32 of the second embodiment comprises a plurality of incline surfaces so as to form a curved surface, and the ring-shaped sidewall 32 has four first positioning portions 321.

Referring to FIG. 4, it shows a heatsink-positioning system of the present invention. The heatsink-positioning system 4 comprises a heatsink 5 and a positioning device 6. The structure of the heatsink 5 is the same as that of the heatsink 3 of the second embodiment in FIG. 3A and FIG. 3B. The heatsink 5 comprises a circular top 51, a ring-shaped sidewall 52 and a plurality of foot portions 53. The ring-shaped sidewall 52 has four first positioning portions 521. The positioning device 6 has a plurality of second positioning portions 61 corresponding to the first positioning portions 521. The shape of the second positioning portion 61 matches the shape of the first positioning portion 521. In the embodiment, the first positioning portions 521 and the second positioning portions 61 are planes. The second positioning portions 61 are used for fixing the first positioning portions 521 so as to fix the heatsink 5 well. By utilizing the foot portions 53 to be a supporting structure in a packaging process with the heatsink 5, a predetermined space for containing a chip can be formed. The heatsink 5 not only protect the chip but also conduct the heat dissipation outside so as to increase the efficiency of the heat dissipation.

Since the ring-shaped sidewall of the heatsink of the invention has a plurality of first positioning portion and the positioning device has a plurality of second positioning portions corresponding to the first positioning portions respectively, the second positioning portions can firmly fix the first positioning portions, so that the problem of displacement of the heatsink can be improved.

While the embodiments of the present invention have been illustrated and described, various modifications and improvements can be made by those skilled in the art. The embodiments of the present invention are therefore described in an illustrative but not restrictive sense. It is intended that the present invention may not be limited to the particular forms as illustrated, and that all modifications that maintain the spirit and scope of the present invention are within the scope as defined in the appended claims. 

1. A heatsink comprising: a circular top; a ring-shaped sidewall, connecting to the circular top, extending away from the circular top, and having at least one first positioning portion for fixing the heatsink; and a plurality of foot portions, connecting to the ring-shaped sidewall and extending away from the ring-shaped sidewall.
 2. The heatsink according to claim 1, wherein the foot portion is a plane.
 3. The heatsink according to claim 1, wherein the ring-shaped sidewall is a single incline.
 4. The heatsink according to claim 1, wherein the ring-shaped sidewall comprises a plurality of incline surfaces.
 5. The heatsink according to claim 1, wherein the foot portion has a first portion and a second portion, one end of the first portion connects to the ring-shaped sidewall and the other end of the first portion connects to the second portion, and the second portion extends away from the first portion horizontally.
 6. The heatsink according to claim 1, wherein each foot portion has an opening.
 7. The heatsink according to claim 1, wherein the heatsink is made of copper.
 8. The heatsink according to claim 1, further comprising a chromium layer or a nickel layer, electroplated on the heatsink for avoiding oxidation.
 9. The heatsink according to claim 1, further comprising a ring-shaped protrusion formed on the circular top and near the edge of the circular top.
 10. A heatsink-positioning system comprising: a heatsink, comprising: a circular top; a ring-shaped sidewall, connecting to the circular top, extending away from the circular top, and having at least one first positioning portion for fixing the heatsink; and a plurality of foot portions, connecting to the ring-shaped sidewall and extending away from the ring-shaped sidewall; and a positioning device, having at least one second positioning portion corresponding to the first positioning portion for fixing the first positioning portion.
 11. The heatsink-positioning system according to claim 10, wherein the shape of the second positioning portion matches the shape of the first positioning portion.
 12. The heatsink-positioning system according to claim 11, wherein the first positioning portion and the second positioning portion are planes.
 13. The heatsink-positioning system according to claim 10, wherein the ring-shaped sidewall is a single incline.
 14. The heatsink-positioning system according to claim 10, wherein the ring-shaped sidewall comprises a plurality of incline surfaces.
 15. The heatsink-positioning system according to claim 10, wherein the foot portion has a first portion and a second portion, one end of the first portion connects to the ring-shaped sidewall and the other end of the first portion connects to the second portion, and the second portion extends away from the first portion horizontally.
 16. The heatsink-positioning system according to claim 10, wherein each foot portion has an opening.
 17. The heatsink-positioning system according to claim 10, wherein the heatsink is made of copper.
 18. The heatsink-positioning system according to claim 10, further comprising a chromium layer or a nickel layer, electroplated on the heatsink for avoiding oxidation.
 19. The heatsink-positioning system according to claim 10, further comprising a ring-shaped protrusion formed on the circular top and near the edge of the circular top. 